Build with new buildNimPackage function

Use Nim 2 in Nix shell

Better build system

Add Direnv and Tup metadata

Do check if the database was actually opened

StringView madness

Export StringView

Pointer cast for idiot language

Avoid the accursed zero-terminated c_str

Cleaner get proc

Version 0.1.2

Make overwriting optional in set(…)

Cleanup flake.nix

Add newDbm[T](…) to API

This allows dbm instances to be created by passing around the
database type rather than a proc for creating some type.

Export meta types and some standard procs

Support for non-string keys and values

Use std::string_view for C++ keys and values

C++ constructor chaos

Initial commit